页面卷曲动画与透明的UIImageView（IOS） [英] page curl animation with transparent UIImageView (iOS)

问题描述

我有一个带状（书签），我想蜷缩，屏幕关闭。色带具有V切出的底部，这是一个透明的部分 - 一个透明的PNG一个UIImageView。

I have a ribbon (bookmark) that I want to curl up, off of the screen. The ribbon has a V cut out of the bottom, which is a transparent section - a UIImageView with a transparent png.

当我在功能区进行卷曲，底层的阴影重新presents整个视图（这在技术上是广场）。我试图让这个看起来尽可能真实，所以如果有人能在正确的方向指向我，那将是有益的。

When I perform a curl on the ribbon, the underlying shadow represents the entire View (which is technically square). I am trying to make this look as real as possible so if someone could point me in the right direction, that would be helpful.

我曾尝试
  - 掩蔽视图
  - 调整开源页面卷曲框架
  - 页面卷曲过程中更换viewAtIndex
  - UIView的动画

I have tried - masking the view - tweaking open source page curl frameworks - replacing the viewAtIndex during a page curl - UIView animations

但它们都导致一个方形阴影。

but they all result in a square shadow.

我目前可以提供最佳的体验是一个简单的UIView动画而淡出：

The best experience I can provide so far is a simple UIView animation while fading out the:

[UIView transitionWithView:_ribbonButton
                       duration:0.5f 
                        options:UIViewAnimationOptionTransitionCurlUp
                     animations:^{
                         [_ribbonButton setAlpha:0.0f];
                     } 
                     completion:^(BOOL completed){
                         [self animationCompleted:completed];
                     }];    

下面是截图： http://livevision.us/word$p$ PSS /？attachment_id = 60

推荐答案

我不认为将使用UIViewAnimationOptionTransitionCurlUp成为可能。视图的动画是基于整个视图边界内，该视图的未内容

I don't think that will be possible using UIViewAnimationOptionTransitionCurlUp. The view animations are based on the entire view bounds, not the contents of the view.

我认为你将不得不code自己的东西在OpenGL或pre-渲染的翻转动画或别的东西。有一些现有的OpenGL解决方案可以下载和定制。

I think you will have to code something yourself in OpenGL or a pre-rendered flip animation or something else. There are a number of existing OpenGL solutions you can download and customize.

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